I have a Wright Sentar with a 61" deck and it mulches fantastic!!!
Unfortunately, I don't believe Wright makes a mulch kit for their mowers, all they offer is a block-off plate. My mulch kit was custom fabricated by my selling dealer. He makes his own mulch kits for just about any mower he sells. All you have to do is get some flat steel and know how to weld and you should be able to make your own, or, ask your dealer if he can make one for you.